I don't think this question has an answer currently, the way Dubois works in the summers towards progressing his game is with a lot of passion, he came in to training camp for the Eagles last season a much stronger, faster, more confident and with a much better shot. You can reasonably expect him to improve him even more this summer, and with his size (6'2.5 200+ pounds) he has the size, its more in his hands and how willing he is to make the jump.
I'm on the belief that it's probably 60/40 that he plays for Columbus next season based on following his progression over the years, its kind of crazy the level of improvement he's made to his play in just two short years (and even as last season progressed, once he was playing center full time, I believe his PPG went to around 1.8+ for the 2nd half of the season, just getting better every game).. for a little bit of context, from his 16 year old season to his 17 year old season --
Goals - 10 > 41
Assists - 35 > 57
Points - 45 > 99
PIMS - 58 > 112
+/- from +4 to +40
While being the driver of any line you put him on, making all his older teammates better (Svechnikov, Lazarev, Joly, etc)
I know obviously a lot of you guys are disappointed about the pick but I can probably answer most questions about Dubois or shed any insight possible.